Is the continuous effect of karma also sustained by karma?

Like say that someone gets cancer which is caused by karma. Now is that cancer staying on that person also sustained by karma, so that if the karma ran out then they would lose the cancer. Or someone wins the lottery, is them having that money also sustained by karma so that if the karma was depleted they would lose the money. When something bad happens does it go away when the karma causing it is depleted? Is the effect sustained by the initial karma or is the effect sustained by other karma. As soon as a karma runs out are you free from its effects or can other karma continue it effects.